Next, I made a model of the volume from Exercise 31 in Section 12.5 of Stewart’s *Essential Calculus*, which is a wedge with a parabolic cylinder cut out of it. The wedge is enclosed by the surfaces \(x=0, z=0, z=1-y\), and \(x=y^2\). First I made the solid in *Mathematica* from the following code (from Professor Keller and Professor Denne):

Then I exported it into Cinema 4D by typing the following:

Then I opened the resultant .wrl file in Cinema 4D. The \(x=0\) is tangential to the curved face, so it would not print unless you cut about a half centimeter off of the tangential surface near the \(z\)-axis (I used a Boolean with the solid and a cube to do this). Additionally, I made equations in Adobe Illustrato*r* (I used Times New Roman 36 Bold Italic font). I then extruded them in Cinema 4D to create 3-dimensional letters, and then imprinted them into the four faces of the object. For further instructions, visit http://home.wlu.edu/~dennee/math_vis.html.

The model looked reasonably good after being printed. The bottom face came out nicely. Near the \(z\)-axis, the solid curled up. Also, the upper edge of the \(x=y^2\) face was a bit jagged, but that can be fixed by changing the *Mathematica *code (increasing the number of PlotPoints). Additionally, the top vertex of the solid is quite messy, which could be fixed by printing the figure on the slanted face (\(y+z=1\)). Also, Professor Finch suggested that the object could be made a bit larger. A description of improvements to the design and what happened in the second print follows soon. You can find the updated solid on Thingiverse here.